package jalview.bin;

import java.awt.Toolkit;

public class HiDPISetting
{
  public static final int dpi;

  public static final int scale;

  private static final int hidpi = 110;

  private static final String scalePropertyName = "sun.java2d.uiScale";

  private static final boolean isAMac;

  private static final boolean isLinux;

  private static final boolean isWindows;

  public static final String forceHiDPISettingPropertyName = "forceHiDPISetting";

  private static final boolean forceHiDPISetting;

  static
  {
    isAMac = System.getProperty("os.name").indexOf("Mac") > -1;
    isLinux = System.getProperty("os.name").toLowerCase()
            .indexOf("linux") > -1;
    isWindows = System.getProperty("os.name").toLowerCase()
            .indexOf("windows") > -1;
    dpi = Toolkit.getDefaultToolkit().getScreenResolution();
    scale = dpi / hidpi + 1;
    String forceHiDPISettingProperty = System
            .getProperty(forceHiDPISettingPropertyName);
    forceHiDPISetting = forceHiDPISettingProperty != null
            && forceHiDPISettingProperty.equalsIgnoreCase("true");
    if (doCondition())
    {
      System.out.println("Property '" + forceHiDPISettingPropertyName + "'="
              + forceHiDPISettingProperty);
      System.out.println("boolean forceHiDPISetting=" + forceHiDPISetting);
      System.out.println("DPI detected as " + dpi
              + ". Scaling factor set to " + scale + ".");
    }
  }

  private static synchronized boolean doCondition()
  {
    return (scale > 1 && isLinux) || forceHiDPISetting;
  }

  public static synchronized String getScalePropertyArg()
  {
    // HiDPI setting. Just looking at Linux to start with. Test with Windows.
    if (doCondition())
    {
      return "-D" + scalePropertyName + "=" + scale;
    }
    return null;
  }
}